I absolutely love this. For $3 it is better than some of the books asking for higher prices. I love the chart in the back that allows you to create a monstrous race from Homebrew or from the ground up if you didn't like how they start off. Too OP, not OP enough, etc. I cannot say enough good things about this book of wonder. Monstrous Races is definitely an always buy, as a player or even as a DM. I encourage all to collect this.
I do hope in the future that maybe this contains some of the other monsters from like Volo's Guide. That would be the only change I see.
[5 of 5 Stars!]